Apparatus for grading abrasives for use in continuous glass grinding machines



Feb. 2, 1932. F. B, wALDRoN ET AL, `1,843,854

APPARATUS FOR GRADING ABRAS IVES FOR USE IN CONTINUOUS GLASS GRINDING MACHINES Filed June 19,- 1950 i W Q n@ u n NR @Q F. ff QJ PatentedFeb. 2, 1932 entrenY sraras rara-Nr .@oi-#FIon FREDERIC BARNES WALDRON, OF FRESCOT, AND JAMES HAR-RIS GRIFFIN, OF ST.

I-LELFJNS, ENGLAND, ASSIGNORS T0 IPILKINGTON BROTHERSLIM-ITED, vOF LIVER- POOL, ENGLAND APPeRA'rUs iron GRADING Aismisrvns rort'iisniiv coiv'ri'niioiis GLASS GRINDING MAcHiivns Application inea June 19, i930, serial No. 462,175, and inereat Britain'iiiiy' 12', i929,

This invention relates to the grading by a horizontal flow process of abrasives for use in continuous glass grinding machines, and has for a particular object, an improved means for ensuring that the quantity of water flowing at any given part of the apparatus shall always be constant so that the grade of abrasive leaving the apparatus at that part shall always be correspondingly constant. To this end the invention comprises means located at suitable intervals along the apparatus, whereby any excess of abrasive-laden water at those parts shall be automatically discharged from the grading apparatus.

The invention is particularly applicable to apparatus in which the grading is carried out continuously and from which abrasive of appropriate grade is continuously supplied at successive stages of the grading operation, to the respective parts of the grinding apparatus requiring those particular grades of abrasive. For this reason, the invention is hereinafter described with reference to a constructional form thereof applied to an apparatus of that character. A portion of such an apparatus suiiicient to show the applica. tion of the invention thereto is diagrammatically illustrated in the accompanying drawings, in which Figure 1 is a side elevation of ay portion of the apparatus;

Figure 2 is a plan, and y Figure 3 is a longitudinal section a portion of the apparatus onv an enlarged scale. V

In the arrangement illustrated, which is to be regarded only as a convenient example, the horizontal flow grader comprises a first section of channel formed by the walls 1. which gradually diverge from theV inlet to the second section of channel formed by the parallel Walls 2. In the third and forth sections the channels formed by the parallel walls 3 and e respectively are each wider apart than in the preceding section. The

fourth section of channeldelivers tlic'water and abrasive into the outflowy 17.

In ythe second, third and fourth sections, submerged partitions vdivide up the channel into tanks in which the different grades of abrasive settle, and each tank terminates,

downwards in a plurality of hoppers 7, 9,

10, each with discharge orifices'S. Y

In the first section the channel is formed in a tank having walls 11, with partitions 18 .between the walls 11 and the walls 1 of the 'Ihe channel has submerged partween the second and thirdk sections is shown in Figure 3. Y

Immediately before each Weir 15 is a trough 18 with discharge pipe 19. The trough 18 is fixed at such a level above the weir 15 as will give the desired head and flow of water over the weir. The trough 18 maintains the level of the water 20 before the weir at substantially constant level, and thereby the rate of flow over the weir is also maintained substantially constant.

Having describedr our invention, we declare that what we claim and desire to secure by Letters Patent is 1. Afhorizontal-flow grader comprising a channel along which the mixture to be graded flows, diverging Walls forming the inlet section of said channel, parallel walls forming succeeding sections of said channel, the width of each parallel-walledsection being greater than that ofthe preceding parallel-walled section, a transverse partition between each two adjacent'sections forming a weir, and a transverse trough arrangedin advance of land at a predetermined-level above each weir.

2. A. .horizontaleilow abrasive grading apparatus comprising a channel along which the abrasive-laden water .flows from end to "end, a plurality of' groups lof submerged transverse partitions, the partitions of each group being at a lower level than the parttions of the preceding group, a Weir between the last partition of each group and the first of the succeeding group, and an overflow inlinediately before each weir.

3. A horizontal-flow abrasive grading apparatus comprising a channel along which the abrasive-laden water Hows from end to end, a plurality of groups of submerged transverse partitions, the partitions of each group being at a lower level than the partitions or" the preceding group,- a submerged transverse partition between each groupy andA the succeeding group higher than the partitions in the preceding group, and an overflow immediately before each of the said higher partitions.

In witness whereof we have alixed our sig'- natures hereto.

FEEDER-IG BARNES -VALDRON JAMES HARRIS GRIFFIN. 

